CODEWITHSUNDEEP
angular
Srikanth Reddy
Srikanth Reddy

Reputation: 545

Service/API calls in Angular

I had started learning angular. I observed that API calls are doing within the ngOnInit. Why not inside the constructor as we are doing dependency Injection also there. I know that component will be completely getting loaded inside the onInit function. So, Is there any problem if we access/call api data in constructor before loading component, if so in which way it will be ?

Upvotes: 0

Views: 740

Answers (1)

Caro
Caro

Reputation: 650

The constructor should be used for dependency injection and to create/init objects. It is JS engine calls constructor and not Angular.

The ngOnInit() method is a special lifecycle hook and give us a signal that Angular has finished initialising the component. ngOnInit() gives us a guarantee that bindings are available and allows you to invoke method calls. It’s a common practice to use ngOnInit to perform initialization logic even if this logic doesn’t depend on dependency injection, DOM or input bindings.

Upvotes: 2

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